Add user guide

Author: alexandru

README.md

@@ -24,33 +24,50 @@ Supported database systems:
 - PostgreSQL
 - SQLite
 
+Built on Java 21+, making good use of virtual threads. Has Scala (2.13, 3.x) integration.
+
 ### Documentation
 
 - [Java Usage Guide](./docs/java-usage-guide.md)
-- [Javadoc](https://javadoc.io/doc/org.funfix/delayedqueue-jvm/0.5.1/org/funfix/tasks/jvm/package-summary.html)
+- [Scala Usage Guide](./docs/scala-usage-guide.md)
+- [Javadoc](https://javadoc.io/doc/org.funfix/delayedqueue-jvm/0.5.1/)
+- [Scaladoc](https://javadoc.io/doc/org.funfix/delayedqueue-scala_3/0.5.1/)
 - [Internals](./docs/internals.md)
 
 ---
 
 Maven:
 ```xml
+<!-- Java or Kotlin -->
 <dependency>
   <groupId>org.funfix</groupId>
   <artifactId>delayedqueue-jvm</artifactId>
   <version>0.5.1</version>
 </dependency>
+<!-- Scala 3 integration-->
+<dependency>
+  <groupId>org.funfix</groupId>
+  <artifactId>delayedqueue-scala_3</artifactId>
+  <version>0.5.1</version>
+</dependency>
 ```
 
 Gradle:
 ```kotlin
 dependencies {
+    // Java or Kotlin
     implementation("org.funfix:delayedqueue-jvm:0.5.1")
+    // Scala 3 integration
+    implementation("org.funfix:delayedqueue-scala_3:0.5.1")
 }
 ```
 
 sbt:
 ```scala
-libraryDependencies += "org.funfix" % "delayedqueue-jvm" % "0.5.1"
+// Base JVM library
+libraryDependencies += "org.funfix" %% "delayedqueue-jvm" % "0.5.1"
+// Scala integration (2.13 or 3)
+libraryDependencies += "org.funfix" %% "delayedqueue-scala" % "0.5.1"
 ```
 
 You will need to add a supported JDBC driver: